CAJ | 학술논문

平原绿化在未来农林发展中具有重要地位。本文利用环境卫星(HJ-1 A/B)多时相数据，选择河南省6月冬小麦收割后的CCD数据，直接去除第二季作物，并利用4月份第一季作物播种前的CCD数据，剔除了一季作物，以及[(NDVI4月≥0.22)与(NDVI6月≥0.35)]提取平原绿化的信息，其与26个主要城市城区绿化信息进行的相关分析达到显著水平(R2=0.9166)。因此，该区的平原绿化解译效果好，而南部信阳市以一季水稻为主的地区及“水稻-冬小麦”过渡区，解译效果较差。除信阳外，由HJ-1卫星解译的河南平原绿化总面积6909.8 km2，占2010年河南省森林面积20.53%。
평원녹화재미래농림발전중구유중요지위。본문이용배경위성(HJ-1 A/B)다시상수거，선택하남성6월동소맥수할후적CCD수거，직접거제제이계작물，병이용4월빈제일계작물파충전적CCD수거，척제료일계작물，이급[(NDVI4월≥0.22)여(NDVI6월≥0.35)]제취평원녹화적신식，기여26개주요성시성구녹화신식진행적상관분석체도현저수평(R2=0.9166)。인차，해구적평원녹화해역효과호，이남부신양시이일계수도위주적지구급“수도-동소맥”과도구，해역효과교차。제신양외，유HJ-1위성해역적하남평원녹화총면적6909.8 km2，점2010년하남성삼림면적20.53%。
The term“afforestation”in this paper generally represents all kinds of non-crop vegetation in crop-dominated plain area, including but not limited to the vegetation in crop land (e.g., orchard, herb, nursery garden, fast-growing and high-yielding timber, farmland shelterbelt, and artificial turf), residential green, urban vegeta-tion landscapes, trees planted alongside the roads and rivers, and the wind break and sand fixation forest. Accu-rate and timely information about afforestation in the plain region is useful because it can reflect the degree of ag-ricultural diversity and the environmental health. However, getting the information about afforestation using re-mote sensing is hindered by some factors: afforestation are spatially scattered, temporally and spectrally over-lapped with some crop lands. In addition, as a land use type, afforestation in plains often shares common spaces with other types of land use, such as croplands and roads. As a result, there is little, if any, data about afforesta-tion in plains, let alone the afforestation change monitoring. As a follow-up to UN Millennium Ecosystem As-sessment, the Chinese government is currently conducting a similar assessment at the provincial level, covering years of 2000-2005-2010, and using the traditional (FAO) land cover/land use system. It is beyond the expecta-tion that the“forest”-as the major indicator of a good environment, in the province such as Henan, has only ex-perienced a negligible increase. This is simply because the recent afforestation in plains was classified as other land cover types. With the advent of Chinese satellite HJ-1 A/B in September 2008, there may be a chance to ex-tract information about afforestation in plains since its CCD sensor has Red and NIR channels, with a 30m spa-tial resolution and a 4-day temporal resolution. To test this potentiality, three steps were taken to extract afforesta-tion in this study:(1) extract the plain information using 2010 Land Cover Map;(2) eliminate the double-crop (winter wheat) land using NDVIJune data when all the wheat had been harvested;(3) eliminate the single-crop land using NDVIApril data. Afforestation was extracted by calculating ((NDVIApril≥0.22)∩(NDVIJune≥0.35)). Validation was conducted using correlation with the statistics of 26 major cities, resulting in a significant R2=0.9166. The al-gorithm performed well in the wheat region, yet it did poor in the rice and rice-wheat transition regions, which are mainly distributed in the southern part of Xinyang. Aside from Xinyang, afforestation area extracted from HJ-1 is 6909.8 km2. This accounts for 20.53%of the total forest in Henan Province. Future study should make full use of HJ-1 high temporal resolution data by conducting zoning according to the climate and the soil.